Thread cutting machine



May 23, 1939. M. w. ANTHONY THREAD CUTTING MACHINE Filed Sept. 25, 1937 2 SheetsSheet l May 23, 1939. M. w4 ANTHoNY i THREAD CUTTING MACHINE Filed Sept. 25, 1937 2 Sheets-Sheet 2 fM-Wmv Patented May 23, 1939 UNITED STATES PATENT OFFICE Claims.

This invention relates to a thread cutting machine.,

An object of the invention is to provide a machine of the character described specially de- 5 signed for cutting threads and has particular relation to novel means for adjusting the cutter bar with relation to the work.

An object of the invention is to provide a thread cutting machine having a cutter mounted thereon with novel means for adjusting the cutter bar whereby the cutter may be applied under the exact control of the operator.A

The machine is specially useful, not only for the purpose of cutting threads, but for the purpose of facing the threads whereby to produce a smooth, nice nish to the threads.

With the above and other obje cts in view, the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in thisapplication and illustrated in the accompanying drawings wherein:

Figure 1 shows a plan view of the device shown partly in section as applied to the Work.

Figure 2 shows a vertical sectional view taken on the line 2-2 of Figure 3.

Figure 3 shows an end elevation showing the lathe carriage in section.

Figure 4 shows an end View, showing the end opposite that shown in Figure 3.

Figure 5 shows a cross sectional view taken on the line 5--5 of Figure 2.

Figure 6 shows a fragmentary plan view partly in section, taken on the line 6-,6 of Figure 3, and

Figure 7 shows a fragmentary side elevation partly in section of the cutter bar illustrating another embodiment.

Referring now more particularly to the drawings wherein like numerals of reference designate the same parts in each of the i'lgures, the numerals I and 2 designate the end members of the framework which have the aligned bearings 3 and 4 respectively, in the latter of which there is mounted a bushing 5 preferably formed of brass or bronze or similar material. This bushing' is split as shown in Figure 3. The end members I and 2 are mounted on a lathe carriage 6 which has the longitudinal dovetailed groove '1. In the groove are the anchor blocks 8, 8 and bolts 9, 9 have their heads countersunk into said blocks and extend upwardly through said end members and have the nuts I0, I0 threaded onto the upper ends thereof. When it is desired to adjust the end members the nuts I0 may be loosened and the adjustment made and then again tightened whereby the blocks 8 will be drawn into clamping relation with the carriage as shown in Figure 3. As clearly illustrated in Figures 3 and 4 the end members I, 2 have the depending legs II, II which flt snugly into the groove 1.

The bearings 3, 4 are in alignment. There is a cutter bar I2 fitted snugly in the bearing 3 at one end and its other is reduced and fitted through the bushing 5 as shown in Figure 2. The bearings 3, 4 are split, as illustrated in Figures 3 and 4. There are the clamp bolts I3, I3, whose inner ends have threaded connections with the end members and whose outer ends are threaded to receive the clamp nuts I4, I4. These clamp bolts extend across the split sides of said end members and by tightening up on the nuts I4, the bearings may be adjusted to t snugly about the cutter bar I2. One end of the cutter bar has a transverse bearing I5 therethrough to receive the bit, .or cutter, I 6. A clamp rod I'I extends axially through the bar I2. One end of the clamp rod bears against the cutter I6 and threaded into the other end of the bar I2 there is a clamp screw I8 whose inner end abuts the opposing end of the clamp rod I'I whereby said `rod may be held in clamping relation with the cutter I6 or released. l That portion of the bar I2 between the end members I, 2 is provided with the external threads I9. Surrounding said threaded portion and located between said end members there is the adjusting sleeve 20 which has a threaded connection with the threads of the bar I2. The

mid-portion of the sleeve 20 is thickened out- Wardly as more clearly shown in Figure 2 and is provided with spaced, radial sockets 2l to receive the inner end of the grip member 22 which may be inserted into one of said sockets for turning the sleeve 2Il and thereby adjusting the bar I2 longitudinally. The ends of the sleeve 20 are reduced in diameter and around said reduced ends are the antifriction bearing assemblies formed by the outer and inner raceway rings 23, 24 and the antifriction bearings 25 between them, thus forming antifriction mountings for the sleeve 20. These bearing assemblies are confined between the end member I at one side and the annular bearing plate 26 at the other side Adjusting screws 2'I are threaded through the end member 2 and their inner ends bear against the plate 26 whereby the bearing assemblies may be adjusted to take up for wear. The elevated, or outwardly thickened portion of the sleeve has graduations 28, as shown in Figure 1 and fastened on the end member I there is a pointer 23 arranged to cooperate with the graduated portion of the sleeve 2U. The sleeve 20 has an inside longitudinal groove 30 in which there is located a jaw 3|, whose inner face is threaded to mesh with the threads I3. A screw 32 is threaded radially through the sleeve with its inner end bearing against the jaw 3 I. The clamp screw 32 may be tightened up against the jaw 3| from time to time to take up the wear between the threads of the bar I2 and the sleeve 20.

Around the outer end of the bar I2 there is a collar 33. It is keyed against rotation, relative to the bar, by means of the key 34 which is held against displacement by means of a clamp screw 35, which is threaded radially therethrough and whose inner end clamps against the key 34. This collar 33 has a bearing 36 therethrough and a guide rod 3l has its inner end suitably anchored to the end member I and its outer end extends through the bearing 36 as shown in Figure 2 whereby the bar I2 is held against turning while it is being longitudinally adjusted.

In operation, the machine may be applied to the work as 38a.. As illustrated in the present instance the work 38a consists of a collar or coupling which is internally threaded. The work may be mounted in and turned by the lathe and the thread cutter I6 fed thereto by the usual lathe manipulations. After the threads have been cut lit is then often desirable to smooth the sides of the threads. The machine is shown, in Figure 1, as applied to the work of smoothing the sides of the threads that have previously been cut. In order to do this Work, the bar I2 must be adjusted longitudinally so as to bring the point, or cutting edge, of the cutter le` into cutting relation with the side of the threads to be smoothed. This requires nice adjustment. It is accomplished by turning the sleeve 20 by use of the handle 22 until the required adjustment has been made. The adjustment will be indicated by pointer 29 with relation to the graduations 28. When one side of the thread has been smoothed throughout, the bar I2 may then be adjusted in a similar manner in the other direction so as to bring the cutting edge in cutting relation with the other side of the thread and said other side of the thread faced off or smoothed. 'I'his will leave the trough between the threads incomplete or unnished as illustrated in Figure 1. The bar I2 may then be adjusted to bring the cutter exactly midway between the threads and the lathe then manipulated to cause thepoint of a cutter to cut out or finish the trough between the threads and thus complete the Work.

A cutter bar I2a as shown in Figure 7 may be substituted for the bar I2 shown in the other ilgures, by removing the bushing 5 and making the substitution. On the bar I2a is the outwardly threaded sleeve 38 which may be adjusted to the desired point on said bar. This sleeve may be held at any point of adjustment by a set screw 39 whose inner end projects into a corresponding recess 40 inthe bar I2a. A number o1'. recesses 40 are provided which are spaced apart along said bar, thus providing for diierent points o! adjustment of the sleeve 38. This adjustment may be made depending on the length of the collar 38a or other Work to be threaded. In this i'orm the cutter I3 may be held in position in the bar by means of the radial set screw 4I. When the bar I2a is used the sleeve 20 will have to have an inside diameter corresponding to the outsidediameter of the sleeve 38.

In other respects the embodiment illustrated in Figure 7 will be the same as that shown in other iigures.

The drawings and description disclose what are now considered to be preferred forms of the invention by way of illustration onlyl while the broad principle of the invention will be dened by the appended claims.

What` I claim is:

1. A machine oi' the character described comprising a trame having end members provided with aligned bearings. a bar mounted for longitudinal movement in said bearings, a cutter on the bar. a sleeve between the end members threaded onto the bar, antifriction means for conilning the sleeve against endwise movement in the frame. means for rotating the sleeve relative to the bar to effect longitudinal adjustment or the bar.

2. A machine of the character described comprising a frame having end members provided with aligned bearings, a bar mounted for longitudinal movement in said bearings, a cutter on the bar, a. sleeve between the end members threaded onto the bar, antifriction means for conning the sleeve against endwise movement in the frame, means for rotating the sleeve relative to the bar to eilect longitudinal adjustment of the bar, and means for taking up wear between the sleeve and bar. -v

' 3. A machine of the character described comprising a frame having end members provided with aligned bearings, a bar mounted for longitudinal movement in said bearing, a cutter on the bar, a rotatable member between the' end members and threaded onto the bar, means for confining said rotatable member against endwise movement in the frame, means for rotating said rotatable member relative to the bar to effect longitudinal adjustment of the bar.

4. A machine of the character described comprising a frame having end members provided with aligned bearings, a bar mounted for longitudinal movement in said bearings, a cutter on lthe bar, a clamp rod extended lengthwise through the bar and clamping the cutter in place, a sleeve between the end members threaded onto the bar, antiiriction means for confining the sleeve against endwise movement at the frame, means for rotating the sleeve relative to the bar to effect longitudinal adjustment of the bar.

5. A machine of the character described comprisinga frame having end members'provided with aligned bearings, a bar mounted for longitudinal movement in said bearings, a cutter on the bar, a sleeve between the end members threaded onto the bar, antifriction means for conning the sleeve against endwise lmovement in the frame, means-for rotating the sleeve relative to the bar to eil'ect longitudinal adjustment of the bar and means for preventing rotation of the bar relative to the frame.

MARK W. ANTHONY. 

